An International Debate: What Is Aran Weight Yarn?

I'm going to bet that "what is Aran weight yarn" is a very popular search term for most knitters and crocheters, especially for Americans who've never had a British knitting friend. I never really thought about what Aran weight yarn is until I started browsing British yarn company websites and noticed that the aran yarn weight was always listed as a category, while worsted weight was nowhere to be found. What is aran weight yarn and why is it so mysterious to Americans?

Let's answer that question -- what is Aran weight yarn? -- and then take a look at a few of the best ways to knit and crochet with it, no matter what country you live in.

Aran Weight Yarn

What is Aran weight yarn?

Aran yarn weight is categorized in medium-weight yarns along with our friend worsted-weight yarn. Check out the Craft Yarn Council's standard yarn weight system and you'll see both of them listed together under that medium category.

Sometimes you'll even see patterns use Aran and worsted interchangeably, noting that you can use a worsted/Aran weight yarn. One reason for this is that in the UK, Aran is much more common while worsted is not widely used to refer to the medium-weight category. But the two are not exactly interchangeable, especially in the U.S. Aran actually weighs slightly more than worsted yarn. Some knitters and crocheters even refer to Aran-weight yarn as "heavy worsted." The Aran yarn weight can be made from any fiber, from wool to acrylic.

When you hear the word "Aran," you might also think about Aran sweater design. An Aran weight yarn and an Aran sweater are not the same. Actually, Aran weight yarn is simply a weight category, while Aran sweaters take their name from the Aran Islands off the coast of Ireland and represent designs with beautiful cables. But of course, knitting an Aran sweater with Aran weight yarn is likely a fabulous idea.

FREE Guide! Choose and Use the Right Yarn

types of yarn guide

Learn everything you need to know about yarn weights and fiber types to make savvy selections and achieve superb stitches.Get My FREE Guide »

Working with Aran weight yarn

If you're substituting Aran yarn on a pattern that uses Aran and worsted weights interchangeably, swatching is very important. Pay close attention to the gauge of the pattern and be sure you're meeting it. Sometimes a pattern might use a worsted weight yarn that's just slightly lighter than an Aran weight yarn, which could throw off your gauge a bit.

Note, too, that as I mentioned previously, British knitters sometimes categorize worsted weight yarns as Aran weight. If you're using a British pattern and substituting the yarn, don't limit yourself to the Aran weights. A worsted weight might work well, too.

Aran zig zag knit cushion pillow
Photo via Craftsy member Design Studio 

Aran weight yarns can be used for almost any project. Just because you make the connection doesn't mean that you should use Aran weight yarn exclusively for Aran sweater designs. Aran's slightly heavy weight makes it perfect for cozy pillows like the zigzag pillow pictured above.

Ruffled crochet bag
Photo via Craftsy member ShiFio

Aran weight yarn is also great for situations when you need a slightly heavier yarn that still looks delicate. The ruffled crochet bag pictured above is a great example of how the weight of Aran can make everyday accessories sturdier -- very important for those of us who tend to carry heavy stuff in our bags like tablets and e-readers!

FREE Guide! Choose and Use the Right Yarn

types of yarn guide

Learn everything you need to know about yarn weights and fiber types to make savvy selections and achieve superb stitches.Get My FREE Guide »


Teva Youngblood

Thank you! I have wondered about this for quite a while. Whenever I googled it, just the sweater and the locale would show up.


Thank you for the explanation. I have wondered for so long thinking it may be a brand of yarn not thinking it could be a weight. Thank for enlightening.


In NZ, we had neither – we had DK (that we also call 8 ply), Treble Knit (12 ply) and bulky (probably 16 ply, but never actually called that). I never saw Sport weight here until about 4 or 5 years ago – that would be equivalent to 5 ply. So, worsted is probably about twice sport weight – that would make it 10 ply – and aran half way between DK and worsted. Clear as mud? (Sorry, couldn’t resist. That was one of my GM’s favorite phrases.) Now I tend to look at the metres (or yards) I need for a project, and the needles recommended, and I swatch. That’s swatch as in do the knitting, wash, block, and THEN check the guage, before beginning. You don’t need to end up with many garments that don’t fit before you realise it’s a good idea.


Thanks for the info. Very helpful in researching patterns on AllFreeCrochet. God is good all the time .. All the time God is good. Let’s start blaming the devil for the evil in the world; not our God!


God wasn’t being very good when he was creating the devil. Hey god, a bit of foresight can be a wonderful thing.

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Joyful Mama

So when I’m looking for some yarn to use, and the yarn needed is listed like this “(4) Medium Weight/Worsted Weight and Aran (16 – 20 stitches to 4 inches), what does that mean? I’m a little bit confused as to which yarn I need to buy. Do I need to buy yarn that states it is both that, or do I just need to buy one or the other? And also, I’m looking for yarn to use but I can’t find a medium worsted weight yarn to use because the hook size I need to use is h/8 or 5mm and all the yarn I’m finding their stats are saying it is for another hook size. Anyone who can help and any information given will be appreciated. Thank you!


I wish someone would have answered this. I would love to know the answers to those questions too. Well, I downloaded the guide. I hope it will help. 🙂


Thank You. I have lots of Red Heart Worsted Weight Yarn. I wondered if that is the same thing.


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